There is a load of differnt styles on the Africa twin
posted here Modif Lucas "Tuning sur @T" - Honda Trail Bike Forums
I would suggest not to make it out of aluminium though, I reckon that it will need to be relatively thick/stiff not to vibrate badly, thus you will need think heavy aluminium sheet (hard to bend smooth at very least) or else it will be very angular.
I would go with fibreglass. it will be an easy case of making the mold from chicken wire (or you can pay for the moding mesh) or cardboard or other plyable stuff untill you get the shap you want.. then it it is just a matter of glassing it up.. (fibreglass is very forgiving and although it does need more post production sanding. it very easy to work with. and fix)
I bet FG turns out to be lighter and if (god forbid) you do come acropper and chest it, it will flex and brake. Ali will not be as forgiving to your body.
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